<template>
<!-- 添加和修改章节表单 -->
<el-dialog :visible="dialogVisible" title="添加章节" @close="close()">
    <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
            <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" />
        </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
        <el-button @click="close()">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate()">确 定</el-button>
    </div>
</el-dialog>
</template>

<script>
import chapterApi from "@/api/chapter";

export default {
    data() {
        return {
            dialogVisible: false, // 是否显示对话框
            chapter: {
                // 章节对象
                sort: 0,
            },
        };
    },

    methods: {
        // 显示对话框
        open(chapterId) {
            this.dialogVisible = true;
            if (chapterId) {
                chapterApi.getById(chapterId).then((response) => {
                    this.chapter = response.data.item;
                });
            }
        },

        // 关闭对话框
        close() {
            this.dialogVisible = false;
            this.resetForm();
        },

        // 重置表单
        resetForm() {
            this.chapter = {
                sort: 0,
            };
        },

        // 保存或更新章节
        saveOrUpdate() {
            if (!this.chapter.id) {
                this.save();
            } else {
                this.update();
            }
        },

        // 保存章节
        save() {
            this.chapter.courseId = this.$parent.$parent.courseId;
            chapterApi.save(this.chapter).then((response) => {
                this.$message.success(response.message);
                // 关闭组件
                this.close();
                // 刷新列表
                this.$parent.fetchNodeList();
            });
        },

        // 更新章节
        update() {
            chapterApi.updateById(this.chapter).then((response) => {
                this.$message.success(response.message);
                // 关闭组件
                this.close();
                // 刷新列表
                this.$parent.fetchNodeList();
            });
        },
    },
};
</script>
